*{
  padding: 0;
  margin: 0;
}
table{
  margin: 50px;
  border: solid 2px black;
  letter-spacing: 1px;
  border-collapse: collapse;
  background: url(../renwu2img/未标题-1.jpg) center;
}
tbody th{
  font-weight: 400;
}
th,td{
  border: solid 1px black;
}
td:last-of-type{
  text-align: center;
}
.tbody2 td{
  width: 100px;
  text-align: left;
}
.tbody3 th{
  font-weight: bold;
}